THERMAL SCIENCE

International Scientific Journal

Shaimaa Almalki

,

Muhammad Ibrahim

,

Jamal S. Anwar

,

Muhammad Ilyas

,

Sayed Abdel Khalek

,

Tahani M. Albogami

,

Khalid M. Khan

QUANTUM CORRELATIONS AND FISHER INFORMATION IN MULTIPARTITE TWO-LEVEL SYSTEM UNDER KERR MEDIUM EFFECT

ABSTRACT
This paper investigates the evolution of global quantum discord (GQD) and quantum Fisher information (QFI) of the interaction of multiple two-level atomic systems (TLS) with a single thermal field mode and a non-linear Kerr medium (NLKM) considering the cases of intrinsic decoherence and its absence. Results indicate that increasing the number of atomic systems (N) while maintaining the NLKM parameter constant χ leads to higher GQD and QFI values for both intrinsic intrinsic decoherence cases. With rising χ, the GQD values decrease but the oscillation rate of the GQD increases. The presence of intrinsic decoherence does not significantly reduce the GQD quasi-static value compared to the no-decoherence scenario for certain χ values. At the same time, a different trend is observed for higher χ values. The average QFI value rises with reduced oscillation amplitudes for higher χ values and larger N subsystems. Unlike the GQD, higher χ values aid in maintaining average QFI in the presence of intrinsic decoherence. For moving TLS, changing χ does not alter the oscillation periods of the GQD and QFI. The GQD values decrease with increased χ in the moving system case, while the QFI improves with higher χ values. Additionally, higher average thermal photons within the system suppress the GQD and QFI values and decrease oscillation amplitudes for both quantifiers.
KEYWORDS
GQD, QFI, quantum entanglement, multipartite quantum system, NLKM, Tavais-Cumming model, intrinsic decoherence
PAPER SUBMITTED: 2024-07-13
PAPER REVISED: 2024-09-30
PAPER ACCEPTED: 2024-10-29
PUBLISHED ONLINE: 2025-02-22
DOI REFERENCE: https://doi.org/10.2298/TSCI2501347A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 1, PAGES [347 - 358]
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Quantum correlations and fisher information in multipartite two-level system under Kerr medium effect

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence